Slitting machine



-pg 2 we J. P. sMxTH SLITTING MACHINE Filed Dec. 1, 1931 Patented Apr. 2, 1935 l UNITED STATES PATENT OFFICE sLl'r'rINdv MACHINE John Paul Smith, Chicago, Ill., assignor to Du Pont Cellophane Company, Inc., New York, N. Y., a corporation of Delaware Application December l, 1931,` Serial No. 578,292 6 Claims. (Cl. 164-39) This invention relates to slitting machines. of casting 33 designedfor cooperation with sup- More particularly the invention relates to the slitport 32 and nut and bolt 34; 33| is an overhanging ting. of regenerated cellulose lms. lip portion of casting 33; 332 is a plate-like por- In the slitting of wide sheets of paper into nartion of casting 33; 335 is a slot for bolt heads rower sheets, little difficulty is experienced berunning the length Of Casting 33; 35 iS a knife 5 cause the paper has suflcient body to resist blade SuDpOlt; 353 iS a DertOn f the knife blade tendencies to wrinkle. Consequently, machines support, 364 is a plate: 365 are screws by of ordinary character win slit; paper j n an enmeans of which a razor blade or other knife tirely satisfactory manner. Considerable difiiblade 31 iS clamped between D1ate354 and Sup- 10 culty is experienced, however, in accurately slit- Dort p01ti0n 363; 36| iS a dependlng D01t10n- 0f 10 ting films of regenerated cellulose. They are Support 35 provided With a h01e fOI COODeTalOn Very thin, have little body, and consequently With nut and bolt 35 in Slot 335; 362 iS an anwrinkle seriously when not supported on a roller eular portion 0f support 36, designed for rm or similar surface. The inability of ordinary sliteontaet and COODelatiOn With DOltOn 33| 0f SUD- ting machines to satisfactorily slit sheets of re- DOI'/ 33- la generated' cellulose results in the production of In the operation 0f my machine a Sheet 0f Ieslit lms having varying widths, fuzzy torn edges generated cellulose or other flexible material is which combine, when used in an automatic wrappassed over smoothing 1011e1S 38 G0 the Surface ping machine, to cause jamming of the machine of supporting rings 2 with which it is maintained and breaking of the film. in rm contact, the knife blades are moved into 20 It is an object of this invention to provide a cutting position abOVe the grOOVeS in the T011- mechanism whereby knife-blade slitting of thin To move the knife blade out of cutting position, cellulosic sheeting may be carried out upon a. the eccentric is rotated into the position shown in surface. Another object of the invention is to Figure 1, which moves the support toward rings provide a. slitting machine for webs of material 2 and carries the knife blade 31 into the groove 25 having little body. Other objects of the inven- 23. Should a. knife blade be slightly oif center tion will be in part apparent, and in part set the bevelled edge 0f the greOVe Will direct the forth as the description proceeds. 'Ihese objects blade into its proper position. Should a blade be are accomplished by the mechanism hereinafter considerably out of alinement, quick adjustment described. thereof can be effected through nut and bolt 35. 30

In the drawing, Fig. l is an end view, partly Should the adjustment of an entire bank of diagrammatic, showing one form of my invenblades (Figure 2 shows four banks) be desired, tion; Fig. 2 is a front view of a machine accordthis adjustment can be obtained by loosening bolt ing to the preferred form of my invention; Fig. 3 34 and sliding the bank in slots provided in supis a view partly in section taken on the line 3 3 port 32 or arms 333-334 for that purpose. vAfter 35 of Fig. 1. the material has been slit it is wound on man- In the figures of the drawing, is a core which drels 39. serves as an axle; 2 are thin annular rings of Rings 2 may be formed by cutting circumferequal size mounted in abutting relation upon the ential slots in the surface of a metal cylinder,

core; 2| are reduced portions of adjacent rings but the resulting product is not as desirable as 40 whose presence forms a circumferential slot 23 that made by the preferred method, because the between abutting faces of adjacent rings. The destruction of asingle ring of the preferred strucouter edge or edges of said slots are bevelled as ture requires only the replacement of the ring, at 22 to facilitate the entry of the knife blade whereas the unit roll must be replaced entirely into the slot. when a single ring is damaged. The slots in the 45 Numeral 3 indicates generally the support for roll should not be so close together that subthe knife blades; 32 is an elongated bar recipstantially no support is given to the film. rocable toward and away from the rings 2 in The rings of the supporting roll may all be of guides not shown; 3| is an eccentric by means of the same width or may be of different Widths, de-

which supporting bar 32 is reciprocated; 3|| is pending upon the necessity of the moment. 50 a lever by means of which eccentric 3| is turned The preferred position of theknife blade is at to reciprocate support 32; 33 is an elongated caste an angle of about 30i10 to the tangent of the ing, of less length than the length of bar- 32, sheet at the cutting point, but it is to be underwhich is attached to bar 32 by means of nut stood that other angles may be used.

and bolt 34; 333 and 334 are U shaped portions If the supports 36 be accurately machined and 55 if the rings 2 be accurately machined, it is possible to set up the entire machine by the simple expedient of accurately alining the end knife with its slot and pushing the other knife supports into contact with the alined support.

In machines operating on the score cutting principle the cutting is accomplished at an angle perpendicular to the travelling film. With my invention the angle of the blade is such, as will be seen by reference to the drawing, that the cutting is done in a direction almost in the plane of the lm. It follows that the knife blade of my machine has little or no tendency to distort the lm out of its plane, and that my machine produces flat lms with uniform width and cleancut edges.

An advantage of my invention lies in the ability to slit light and easily distorted films accurately. Another advantage of the invention lies in the ability to remove or adjust individual blades or rings of the machine without disturbing the set up. Another advantage of the invention lies in the ability to aline the entire set up accurately by the alining of one support alone. Another advantage lies in the ability to slit sheets of material without crushing, while that material is upon the surface of a support. Other advantages or the invention will be apparent.

As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that I do not limit myself to the specific embodiments thereof except as defined in the appended claims.

I claim:

1. A slitting machine comprising a supporting roll having a thin circumferential slot with a bevelled edge, and a knife mechanism for cooperation with said roll and slot comprising a non-rotary knife blade and an adjustable support therefor reciprocable toward and away from the roll.

2. A slitting machine comprising a supporting roll having annular rings mounted in abutting relation, the abutting edges of the said rings being reduced to provide a thin slot having bevelled edges, andA a knife mechanism for cooperation with said roll and slot comprising a knife blade and an adjustable support therefor reciprocable toward and away from the roll.

3. A slitting machine comprising a core, a supporting roll comprising annular rings mounted in abutting relation on the core, the abutting edges of the said rings being reduced to provide a thin slot having bevelled edges, and a knife mechanism for cooperation with said roll and slot comprising a laterally adjustable blade support reciprocable toward and away from the roll, and a knife blade mounted on the blade support.

4. A slitting machine comprising a core, a supporting roll comprising annular rings of equal Width mounted in abutting relation on the core, the abutting edges of the said rings being reduced to provide a thin slot, bevelled portions on the edges of said slot, and a knifel mechanism for cooperation with said roll and slot comprising a support reciprocable toward and away from the roll, a blade support mounted for lateral adjustment on the reciprocable support, and a knife blade mounted on the blade support.

5. In a machine for slitting travelling films, a film-supporting roll having a thin circumferential slot with bevelled edges, a knife blade alined in said slot at an angle such that slitting takes place in a direction substantially in the plane of the film.

6. In a slitting machine a supporting roll having thin circumferential slots, knife blades for operation secant-Wise of said slots, and-means for mounting said knife blades comprising a support movable toward and away from said roll, a plurality of bars adjustably mounted on said support and a plurality of knife blades adjustably carried by each said bar.

JOHN PAUL SMITH. 

